JP4721985B2 - Flexible tube - Google Patents

Description

  The present invention relates to a flexible flexible tube used as a pipe for hot and cold water supply in toilets, washstands, kitchens and the like.

  Conventionally, a flexible stainless steel spiral pipe or a flexible copper pipe whose surface is plated has been used as a piping for water supply and hot water supply in a toilet or a washstand. However, a stainless steel spiral tube may be corroded when a detergent is attached, and is especially easily corroded by a chlorinated detergent. Corrosion may also occur due to adhesion of dust, dust, iron, and the like. Further, stainless steel spiral pipes and copper pipes tend to condense on the surface, and the condensed water eventually becomes water droplets and falls to the floor, so the floor surface and flooring material are often soiled. Then, what has coat | covered the outer periphery of the metal bellows pipe | tube with the resin bellows pipe | tube is proposed (for example, refer patent document 1).

  In the case of the “covered bellows tube” described in Patent Document 1, since the outer periphery of the metal bellows tube is covered with a resin bellows tube, even if a detergent or a drug adheres to the resin bellows tube, The bellows tube does not corrode. Further, even if dust, dust, iron or the like adheres to the resin bellows tube, the metal bellows tube does not corrode. In addition, this “covered bellows tube” has an air layer formed between the metal bellows tube and the resin bellows tube, and this air layer exhibits a certain amount of heat insulation, thus reducing condensation. Can do.

Japanese Utility Model Publication No. 1-77183

  In the case of the “covered bellows tube” described in Patent Document 1, both ends of the resin bellows tube are only in contact with the cap nuts attached to both ends of the metal bellows tube. The airtightness of the air layer formed between the two bellows tubes is insufficient. For this reason, the heat insulation effect of an air layer is also inadequate, and the dew condensation prevention effect may not be acquired.

  The problem to be solved by the present invention is to provide a flexible tube that is excellent in corrosion resistance and can prevent condensation while maintaining good flexibility and workability.

The flexible tube of the present invention is
A corrugated pipe made of a synthetic resin having flexibility in which large-diameter portions and small-diameter portions having different inner diameters are alternately arranged along the axial direction;
A flexible metal bellows tube inserted into the corrugated tube in a state in which the hook-shaped portions formed in the opening portions on both ends protrude from the openings on both ends of the corrugated tube;
A cap nut attached to the outer periphery of the bowl-shaped portion in a state of being coaxially connected to the bellows tube and being attached to the outer periphery of the flange-like portion so as not to be detached;
A sleeve portion inserted between the corrugated tube and the bellows tube, a flange portion sandwiched between the opening of the corrugated tube and the cap nut, and a large diameter portion of the corrugated tube A hermetic member having a protrusion formed on the outer periphery of the sleeve portion,
It is provided with.

  With such a configuration, the outer periphery of the metal bellows tube is covered with a synthetic resin corrugated tube, so that the flexibility and workability can be maintained well, and the corrosion resistance is also excellent. ing. Further, the sleeve portion of the airtight member is inserted between the corrugated tube and the bellows tube, the protrusion on the outer periphery of the sleeve portion is engaged with the large diameter portion of the corrugated tube, and the flange portion is connected to the opening of the corrugated tube and the bag. It is clamped between nuts. Therefore, the air layer formed between the corrugated tube and the bellows tube is almost completely sealed by the airtight member in the vicinity of both ends of the corrugated tube, and high airtightness is obtained. For this reason, the heat insulation effect of an air layer is high and dew condensation can also be prevented. Furthermore, since the cap nut and the airtight member are separate members, it is relatively easy to rotate the cap nut when the flexible tube is attached to or detached from another piping member.

Next, the flexible tube of the present invention is
A corrugated pipe made of a synthetic resin having flexibility in which large-diameter portions and small-diameter portions having different inner diameters are alternately arranged along the axial direction;
A flexible metal bellows tube inserted into the corrugated tube in a state in which the hook-shaped portions formed in the opening portions on both ends protrude from the openings on both ends of the corrugated tube;
A large diameter of the corrugated tube is inserted between the corrugated tube and the bellows tube, and is attached to the outer periphery of the bowl-shaped portion in a state of being coaxially connected to the bellows tube and being unmovable. A cap nut provided with a sleeve portion formed on the outer periphery with a protrusion for engaging with the portion;
It is provided with.

  With such a configuration, as described above, since the outer periphery of the metal bellows tube is covered with a synthetic resin corrugated tube, flexibility and workability can be maintained well. Excellent corrosion resistance. In addition, the sleeve portion of the cap nut is inserted between the corrugated tube and the bellows tube, and the protrusion on the outer periphery of the sleeve portion is engaged with the large diameter portion of the corrugated tube. The air layer formed in this manner is almost completely sealed by cap nuts near both ends of the corrugated tube, and high airtightness is obtained. For this reason, the heat insulation effect of an air layer is high and dew condensation does not occur. Furthermore, since the sleeve portion is integrated with the cap nut, the number of parts can be reduced and the structure can be simplified.

  Here, it is desirable to arrange a ring-shaped packing between the sleeve portion of the airtight member or the sleeve portion of the cap nut and the large diameter portion of the corrugated tube. With such a configuration, the airtightness between the sleeve portion of the airtight member and the corrugated pipe, or the airtightness between the sleeve portion of the cap nut and the corrugated pipe, can be improved, so that the air layer This improves the heat insulation effect and further increases the dew condensation prevention effect.

  On the other hand, the sleeve portion may be provided with a tapered portion having a diameter reduced from the protruding portion toward the axial center of the bellows tube. With such a configuration, the tapered portion is in close contact with the inner peripheral surface in a state in which the inner peripheral surface of the small-diameter portion of the corrugated tube is expanded, and thus is effective in improving airtightness. In addition, in the assembly process, when the sleeve portion of the airtight member or the sleeve portion of the cap nut is inserted into the gap between the corrugated tube and the bellows tube, the taper portion reduced in diameter toward the center in the axial direction of the bellows tube Thus, the charging operation can be facilitated.

  According to the present invention, it is possible to provide a flexible tube that is excellent in corrosion resistance and can prevent condensation while maintaining good flexibility and workability.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a partially cutaway side view showing a flexible tube according to a first embodiment of the present invention, FIG. 2 is an end view of the flexible tube shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA in FIG.

  As shown in FIGS. 1 to 3, the flexible tube 10 of the present embodiment includes a synthetic resin corrugated tube 11, a stainless steel bellows tube 12, a cap nut 13, an airtight member 14, and a ring-shaped packing 15. And. That is, a stainless-steel bellows tube 12 is inserted into a flexible corrugated tube 11 in which large-diameter portions 11a and small-diameter portions 11b having different inner diameters are alternately arranged along the axial direction D. The flange portion 12b formed in the opening portion 12a protrudes from the opening portions 11c at both ends of the corrugated tube 11, and the cap nut 13 communicates coaxially with the bellows tube 12 on the outer periphery of the flange portion 12b. It is attached so that it can rotate freely and cannot be detached.

  The airtight member 14 includes a sleeve portion 14a inserted between the corrugated tube 11 and the bellows tube 12, a flange portion 14b sandwiched between the opening 11c of the corrugated tube 11 and the cap nut 13, and a corrugated tube. 11 and a protrusion 14c formed on the outer periphery of the sleeve portion 14a to be engaged with the large diameter portion 11a. In addition, a tapered portion 14d having a diameter continuously reduced from the protruding portion 14c of the airtight member 14 toward the center in the axial direction D of the bellows tube 12 is provided. The length in the axial direction D of the large diameter portion 11a of the corrugated pipe 11 is formed to be larger than the length in the axial direction D of the small diameter portion 11b.

  As shown in FIG. 3, the inner diameter of the reduced diameter portion 13a of the cap nut 13 is formed larger than the outer diameter of the straight tube portion 12d of the bellows tube 12 and smaller than the outer diameter of the flange portion 12b. The whole 13 is rotatable and non-detachable on the outer periphery of the bowl-shaped portion 12b. The inner diameter of the airtight member 14 is formed larger than the outer diameter of the straight pipe portion 12d of the bellows tube 12, the outer diameter of the flange portion 14b is larger than the outer diameter of the small diameter portion 11b of the corrugated tube 11, and larger than the outer diameter of the large diameter portion 11a. It is formed small. Further, the outermost periphery of the protrusion 14c of the airtight member 14 is formed larger than the inner periphery of the small diameter portion 11b of the corrugated tube 11 and smaller than the inner diameter of the large diameter portion 11a. Further, the length in the axial direction D of the tapered portion 14 d of the airtight member 14 is formed longer than the length in the axial direction D of the large diameter portion 11 a of the corrugated tube 11. A ring packing 15 is sandwiched between the outer periphery of the sleeve portion 14 a of the airtight member 14 and the large diameter portion 11 a of the corrugated tube 11.

  The flexible tube 10 has a structure in which the outer periphery of the stainless-steel bellows tube 12 is covered with a synthetic resin corrugated tube 11, so that the flexibility and workability can be maintained well, and the corrosion resistance is also improved. Are better. Further, the sleeve portion 14a of the airtight member 14 is inserted between the corrugated tube 11 and the bellows tube 12, and the protrusion 14c on the outer periphery of the sleeve portion 14a is engaged in the large-diameter portion 11a of the corrugated tube 11, so that the flange The portion 14 b is sandwiched between the opening 11 c of the corrugated tube 11 and the reduced diameter portion 13 a of the cap nut 13.

  Therefore, since the air layer R formed between the corrugated tube 11 and the bellows tube 12 is almost completely sealed by the airtight member 14 in the vicinity of both ends of the corrugated tube 11, high airtightness is obtained. Therefore, air does not move between the air layer R and the atmosphere, and the heat insulating action of the air layer R is enhanced, so that dew condensation can be prevented. Further, since the airtight member 14 and the cap nut 13 are separate members, the rotating operation of the cap nut 13 is relatively easy. As shown in FIG. 3, the airtight member 14 and the cap nut 13 are separate members, and the flange portion 14b of the airtight member 14 and the reduced diameter portion 13a of the cap nut 13 are slidable. The work of turning the cap nut 13 when connecting 10 to another piping member such as a water supply pipe is also easy.

  Further, since the outer periphery of the sleeve portion 14a of the hermetic member 14 is provided with a taper portion 14d, the inner periphery of the corrugated tube 11 is expanded in the inner peripheral surface of the small diameter portion 11b. Since it adheres to the surface, it is effective in improving airtightness. Further, in the assembly process of the flexible tube 10, when the sleeve portion 14 a of the airtight member 14 is inserted into the gap between the corrugated tube 11 and the bellows tube 12, the diameter is reduced toward the center 12 c in the axial direction D of the bellows tube 12. Since the charging can be performed with the tapered portion 14d at the head, the charging operation is easy. Furthermore, as shown in FIG. 3, since the ring-shaped packing 15 is sandwiched between the outer periphery of the sleeve portion 14a of the airtight member 14 and the large diameter portion 11a of the corrugated tube 11, the airtightness of the air layer R is high. The airtight state can be maintained.

  Next, a second embodiment of the present invention will be described based on FIGS. 4 is a partially cutaway side view showing a flexible tube according to a second embodiment of the present invention, FIG. 5 is an end view of the flexible tube shown in FIG. 4, and FIG. 6 is a sectional view taken along line BB in FIG. In FIGS. 4 to 6, portions denoted by the same reference numerals as those illustrated in FIGS. 1 to 3 are portions having the same structure and function as the constituent portions of the flexible tube 10, and description thereof is omitted.

  As shown in FIGS. 4-6, the flexible tube 20 of this embodiment is equipped with the airtight member 24 which has substantially the same structure and function as the airtight member 14 used for the flexible tube 10 shown in FIGS. 1-3. ing. The sleeve portion 24a, the flange portion 24b, the projection portion 24c, and the taper portion 24d that constitute the airtight member 24 correspond to the sleeve portion 14a, the flange portion 14b, the projection portion 14c, and the taper portion 14d that constitute the airtight member 14, respectively. The inner diameter of the sleeve portion 24 a of the airtight member 24 is substantially the same as the outer diameter of the straight tube portion 12 d of the bellows tube 12, and the inner peripheral surface of the sleeve portion 24 a of the airtight member 24 is the outer periphery of the straight tube portion 12 d of the bellows tube 12. It is in close contact with the surface.

  In the flexible tube 20, as shown in FIG. 6, the corrugated tube 11 made of a synthetic resin having elasticity is arranged in a slightly compressed state in the axial direction D. Therefore, due to the restoring force in the axial direction D, The openings 11 c at both ends of the corrugated pipe 11 are in close contact with the flange portion 24 b of the airtight member 24 and press the flange portion 24 b against the reduced diameter portion 13 a of the cap nut 13. Further, the protruding portion 24c and the tapered portion 24d of the sleeve portion 24a located in the gap between the bellows tube 12 and the corrugated tube 11 are in contact with the large diameter portion 11a and the small diameter portion 11b of the corrugated tube 11, respectively. For this reason, the airtightness with the bellows tube 12 in the vicinity of the opening 11c of the corrugated tube 11 is maintained well, and the ring-shaped packing 15 constituting the flexible tube 10 shown in FIG. 3 is unnecessary. The airtight member 24 and the cap nut 13 are separate members, and the flange portion 24b of the airtight member 24 and the reduced diameter portion 13a of the cap nut 13 are slidable. The work of turning the cap nut 13 when connecting to the piping member is also easy.

  Next, a third embodiment of the present invention will be described based on FIGS. 7 is a partially cutaway side view showing a flexible tube according to a third embodiment of the present invention, FIG. 8 is an end view of the flexible tube shown in FIG. 7, and FIG. 9 is a sectional view taken along the line CC in FIG. 7 to 9, the parts denoted by the same reference numerals as those shown in FIGS. 1 to 3 are parts having the same structure and function as the constituent parts of the flexible tube 10, and the description thereof is omitted.

  As shown in FIGS. 7-9, in the flexible tube 30 of this embodiment, these members are integrated instead of the airtight member 14 and the cap nut 13 which comprise the flexible tube 10 shown in FIGS. 1-3. A cap nut 33 having a structured structure is used. That is, in the flexible tube 30, a cap nut 33 is attached to the outer periphery of the bowl-shaped portion 12 b in a state of being coaxially connected to the stainless steel bellows tube 12, and is rotatable and cannot be detached. The portion 33a is connected to a sleeve portion 33c that is inserted between the corrugated tube 11 and the bellows tube 12 and has a projection 33b formed on the outer periphery for engaging with the large-diameter portion 11a of the corrugated tube 11. Yes. A ring-shaped packing 15 is sandwiched between the large diameter portion 11a of the corrugated tube 11 and the sleeve portion 33c.

  As shown in FIG. 9, the inner diameter of the sleeve portion 33 c is larger than the outer diameter of the straight tube portion 12 d of the bellows tube 12, and the outer diameter of the sleeve portion 33 c excluding the protruding portion 33 b is substantially the same as the inner diameter of the small diameter portion 11 b of the corrugated tube 11. It is formed in the same size. Therefore, the outer peripheral surface of the sleeve portion 33 c excluding the protruding portion 33 b is in close contact with the inner peripheral surface of the small diameter portion 11 b of the corrugated tube 11. Further, the maximum outer diameter of the protruding portion 33b is larger than the inner diameter of the small diameter portion 11b of the corrugated tube 11 and smaller than the inner diameter of the large diameter portion 11a. Further, the protrusion 33 b has a tapered shape with a diameter continuously reduced toward the center in the axial direction D of the bellows tube 12.

  In the case of the flexible tube 30 of the present embodiment, since it is configured using the cap nut 33 having a structure in which the airtight member 14 and the cap nut 13 are integrated, the number of parts can be reduced and the structure can be simplified. Assembling work is also easy.

  The flexible pipe of the present invention can be widely used as piping for water supply and hot water supply in toilets, washstands, kitchens and the like.

It is a partially notched side view which shows the flexible tube which is 1st Embodiment of this invention. It is an end view of the flexible tube shown in FIG. It is the sectional view on the AA line in FIG. It is a partially notched side view which shows the flexible tube which is 2nd Embodiment of this invention. FIG. 5 is an end view of the flexible tube shown in FIG. 4. It is the BB sectional view taken on the line in FIG. It is a partially notched side view which shows the flexible tube which is 3rd Embodiment of this invention. FIG. 8 is an end view of the flexible tube shown in FIG. 7. It is CC sectional view taken on the line in FIG.

Explanation of symbols

10, 20, 30 Flexible tube 11 Corrugated tube 11a Large diameter portion 11b Small diameter portion 11c, 12a Opening portion 12 Bellows tube 12b Gutter-shaped portion 12c Center 12d Straight tube portion 13, 33 Cap nut 13a, 33a Reduced diameter portion 14, 24 Airtight Member 14a, 24a, 33c Sleeve part 14b, 24b Flange part 14c, 24c, 33b Protrusion part 14d, 24d Taper part 15 Ring-shaped packing D Axial direction R Air layer

Claims (4)

A corrugated pipe made of a synthetic resin having flexibility in which large-diameter portions and small-diameter portions having different inner diameters are alternately arranged along the axial direction;
A flexible metal bellows tube inserted into the corrugated tube in a state in which the hook-shaped portions formed in the opening portions on both ends protrude from the openings on both ends of the corrugated tube;
A cap nut attached to the outer periphery of the bowl-shaped portion in a state of being coaxially connected to the bellows tube and being attached to the outer periphery of the flange-like portion so as not to be detached;
A sleeve portion inserted between the corrugated tube and the bellows tube, a flange portion sandwiched between the opening of the corrugated tube and the cap nut, and a large diameter portion of the corrugated tube A hermetic member having a protrusion formed on the outer periphery of the sleeve portion,
A flexible tube characterized by comprising: A corrugated pipe made of a synthetic resin having flexibility in which large-diameter portions and small-diameter portions having different inner diameters are alternately arranged along the axial direction;
A flexible metal bellows tube inserted into the corrugated tube in a state in which the hook-shaped portions formed in the opening portions on both ends protrude from the openings on both ends of the corrugated tube;
A large diameter of the corrugated tube is inserted between the corrugated tube and the bellows tube, and is attached to the outer periphery of the bowl-shaped portion in a state of being coaxially connected to the bellows tube and being unmovable. A cap nut provided with a sleeve portion formed on the outer periphery with a protrusion for engaging with the portion;
A flexible tube characterized by comprising:   The flexible pipe according to claim 1 or 2, wherein a ring-shaped packing is disposed between a sleeve part of the airtight member or a sleeve part of the cap nut and a large diameter part of the corrugated pipe.   The flexible tube according to any one of claims 1 to 3, wherein a taper portion having a diameter reduced from the protruding portion toward an axial center of the bellows tube is provided in the sleeve portion.

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